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Contour Interval Formula

Contour Interval Formula, To calculate contour interval, we want to divide the distinction in elevation between the index contour traces by way of the range of contour traces from one index contour line to the next. For example, if the distance 200 is divided with the aid of the variety of lines, the place the wide variety of traces is 5. The contour interval is equal to 200 / 5 = 40, or 40-unit contour intervals.

What is Contour Interval ?

A contour interval is a vertical distance or the distinction in the elevation between the two contour traces in a topographical map. Generally, there are quite a number contour intervals for the a number of maps. Taking the region to be mapped, contour intervals are considered. In each map, on the right-hand backside side, the contour interval is described. The oftentimes utilized contour interval is 20 toes for a 1:24,000 map scale.

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Uses of Contour Intervals in Surveying

When a giant place is to be mapped in small piece of paper contour intervals are used. A greater contour interval is used for a giant region and small contour interval for small area. In a giant map, index contour traces are much less to maintain it easy to study the map easily. In this case, to discover out the intermediate factors elevation, contour intervals are used. Earthwork estimations for any kind of structure like bridges, dams or roads can be located out with the assist of contour intervals in a map.

How To Calculate Contour Interval On Maps?

These index strains will be mentioned with their elevation. Discover the elevations of two adjoining index lines. The largest quantity shows the uphill rise. Locate the distinction between the two elevations. A contour map includes contour strains of a given geographical region. To preserve the contour map effortless and comprehensible to read, no longer each and every contour line is marked with its elevation reading.

These marked or tagged strains are remembered or termed index contour Lines. In the above picture, the darkish strains with studying are index contour lines.

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Example Contour Interval Calculation

Considering the map, the following steps are used to calculate the contour intervals calculation as follows: Let’s say, 7000 and 7100 and calculate the interval between them. Now the distinction between 7100 and 7000 is 7100 – 7000 = 100. The range of contour traces is four between 7000 and 7100. Add 1 to 4, 4 + 1 = 5 Now divide 100 by using 5, 100/5 = 20 units The contour interval of the above map gave us 20 units.

Rules of Contour Intervals Every factor of a contour line has a comparable elevation. Contour strains awesome uphill from downhill. Contour traces in no way contact or pass every different than at a cliff. Every fifth contour line is darker in shade than different contour lines. This is an INDEX contour line. Contour strains are nearer collectively in steep terrain and farther aside in flat areas.

Characteristics of Contour in Surveying

The most important attribute of the contour can be listed as follows: The horizontal distance between any two contour strains shows the quantity of slope and varies inversely on the quantity of slope. Two contours of one-of-a-kind elevations by no means move every different without in the case of an overhanging cliff. Contours of various elevations by no means unite to shape a single contour without in the case of a vertical cliff. Contours that are shut to every different depict a steep slope whereas the contours drawn aside depict a mild slope. The equally spaced contours depict a uniform slope. When the contours are drawn parallel, equidistant, and straight, such contours point out inclined aircraft surfaces.

Purpose of the Map

For highways and railways, the contour interval is stored up to 2m For earthworks, constructing sites, dams etc. the interval is saved as small as 0.5m For town surveys, a contour interval of 0.5 m might also be adopted For geological surveys, 6 to 15 m can be adopted For city planning surveys, 0.5 to 2m interval can be chosen, for scale 1cm = 15 to 100m For Location Surveys, interval of 2-3m for scale 1 cm = 50 to 200 m can be adopted

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